A395182 Values of Jordan's totient function J_2 (A007434) which are not values of Euler's totient function (A000010).

3, 29928, 100488, 259080, 502680, 597528, 619368, 896808, 1708248, 2093808, 2493240, 2601768, 2647128, 3485688, 4798248, 5508408, 6086088, 7252248, 10936248, 11648568, 12581208, 14462808, 15389928, 16056048, 18003048, 18258264, 20857488, 21132408, 21756744, 22306728, 22972848

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Example

3 is a term since (2^2-1)*(2^2)^0 = 3 and 3 is not in A002202.
29928 is a term since (173^2)*(173^2)^0 = 29928 and 29928 is not in A002202.
4798248 is a term since (13^2-1)*(13^2)^2 = 4798248 and 4798248 is not in A002202.

Prog

(PARI) {A007434(n) = if( n<1, 0, direuler( p=2, n, (1 - X) / (1 - X*p^2))[n])};
lst(lim) = my(A=[]); for(k = 1, oo, if(#A>=lim, break); if(!istotient(A007434(k)), A = concat(A, A007434(k)))); A

Crossrefs

Cf. A000010, A002202, A007434, A395181.

Sequence in context: A225835 A007350 A003839 * A297023 A175875 A030463

Adjacent sequences: A395179 A395180 A395181 * A395183 A395184 A395185

Keyword

nonn

Author

Miles Englezou, Apr 15 2026

Status

approved